基于虚拟电阻的复杂直流网络P-V下垂控制方法

针对复杂直流网络控制困难的问题且现有文献很少有基于虚拟电阻的下垂系数计算方法的情况,设计了一种将复杂电网等效为简单放射状网络的方法,并提出一种基于虚拟电阻的P-V下垂控制方法。首先,定义虚拟母线及虚拟节点,将节点分为3类并分别处理,得到一个等效的放射状电网拓扑结构。然后,根据简化结果推导出P-V下垂系数的求取公式,得出控制策略。最后,仿真结果表明了所提电网等效方法和基于虚拟电阻的P-V下垂控制策略的有效性和可行性。关键词：虚拟节点；虚拟电阻；PV下垂控制；复杂直流系统；网络等效化简

Virtual impedance-based PV sag control method for complex DC systems

To address the problem of difficult control of complex DC networks and the fact that there are few methods for calcu-lating sag coefficients based on virtual resistances in the existing literature, a method is designed to equate complex grids into simple radial networks, and a P-V sag control method based on virtual resistances is proposed. First, virtual bus and virtual nodes are defined, and the nodes are divided into three categories and treated separately to obtain an equivalent radial grid topology. Then, the equation of P-V sag coefficient is derived from the simplified results and the control strategy is derived. Finally, the simulation results show the effectiveness and feasibility of the proposed grid equivalence method and virtual resistance-based P-V sag control strategy.Keywords: virtual bus; virtual resistance; p-v droop control; complex DC grid; network equivalence simplification